Myristic acid-graphite nanoplates (MA/Gr) composite phase change materials were prepared and thermal properties at various Gr loadings, 0.5%, 1% and 2%, were investigated. Melting and freezing temperatures, latent heats of melting and freezing, the extent of supercooling and the crystallization fraction were obtained with respect to the Gr loadings. It is observed that the Gr loading does not affect the crystallization fraction, but decreases the extent of supercooling. The effect of Gr loading on thermal stability and functional groups of myristic acid was determined by thermogravimetric and Fourier transform infrared analyses, respectively. Thermal conductivity of Myristic acid increased by 8%, 18% and 38% after Gr loadings of 0.5%, 1% and 2% into MA, respectively. Thermal cycling test was also conducted at various thermal cycles (1, 10, 40, 70 and 100 cycles). Repeated melting/freezing cycles have no significant effect on the thermal properties and chemical stability of MA/Gr composites. (C) 2014 Elsevier Ltd. All rights reserved.